CN114759883A - Low-noise amplification module for coping with multiple frequency bands - Google Patents

Low-noise amplification module for coping with multiple frequency bands Download PDF

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Publication number
CN114759883A
CN114759883A CN202210543543.2A CN202210543543A CN114759883A CN 114759883 A CN114759883 A CN 114759883A CN 202210543543 A CN202210543543 A CN 202210543543A CN 114759883 A CN114759883 A CN 114759883A
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circuit
transmission
noise amplification
signal
reception
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吉见俊二
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Abstract

The present invention provides a multiband low noise amplification module having improved amplification efficiency of a transmission signal, comprising: a first filter circuit; a second filter circuit; at least one low noise amplification circuit; a reception input switch that selectively transmits a first reception signal output from the first filter circuit and a second reception signal output from the second filter circuit to one of the at least one low noise amplification circuit, respectively; and a second tuning circuit that adjusts impedance matching based on changes in the state of impedance matching between the first and second filter circuits and the at least one low-noise amplifier circuit, the second tuning circuit being connected between the reception input switch and the at least one low-noise amplifier circuit.

Description

Low-noise amplification module for coping with multiple frequency bands
The application is a divisional application, and the original application is an invention patent application with the application date of 2018, 5 and 15, the application number is 201810461715.5, and the invention name is 'power amplification module for coping with multiple frequency bands'.
Technical Field
The invention relates to a low-noise amplification module for multiple frequency bands.
Background
In the background of high-density mounting of mobile communication terminals such as cellular phones, various components such as an antenna switch, an input switch, an output switch, a duplexer, a power amplifier circuit, a low-noise amplifier circuit, and a matching circuit are commonly used to reduce the number of components.
For example, patent document 1 discloses a power amplification module having M inputs and N outputs, at least two or more of the M inputs being connected to switches of distribution paths, respectively, and including a plurality of filter circuits and one power amplification circuit.
On the other hand, in recent years, with an increase in communication traffic handled by mobile communication terminals, development of a communication technology called Carrier Aggregation (CA) that simultaneously uses a plurality of frequency bands (frequency bands) has been advanced. By using CA, the communication speed and communication quality of the mobile communication terminal can be improved.
Prior art documents
Patent literature
Patent document 1: specification of U.S. patent application publication No. 2016/0119015
However, the power amplifier module described in patent document 1 has no description about a configuration for coping with CA. For example, in the configuration for CA, a case where the output terminal of the power amplification circuit is connected to one path and a case where the output terminal is connected to two paths can be considered. At this time, in the case where the output terminal is connected to one path and the case where the output terminal is connected to two paths, the matching state of the output impedance of the power amplification circuit and the load impedance may vary. In this manner, when the power amplification module described in patent document 1 is applied to CA, impedance matching may be degraded, and amplification efficiency of a transmission signal in the power amplification module may be degraded.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a low noise amplifier module capable of coping with multiple frequency bands, which can improve the amplification efficiency of a transmission signal.
A multiband low noise amplification module according to an aspect of the present invention includes: a first filter circuit; a second filter circuit; at least one low noise amplification circuit; a reception input switch that selectively transmits a first reception signal output from the first filter circuit and a second reception signal output from the second filter circuit to one of the at least one low noise amplification circuit, respectively; and a second tuning circuit that adjusts impedance matching based on changes in the state of impedance matching between the first filter circuit and the at least one low-noise amplifier circuit, and the second filter circuit, the second tuning circuit being connected between the reception input switch and the at least one low-noise amplifier circuit.
A power amplification module compatible with multiple frequency bands according to an aspect of the present invention includes: at least one transmission input terminal; at least one power amplifier circuit to which a first transmission signal and a second transmission signal are input from at least one transmission input terminal; a first filter circuit that passes a first transmission signal; a second filter circuit that passes the second transmission signal; at least one transmission output terminal that outputs the first transmission signal and the second transmission signal output from the first filter circuit and the second filter circuit; a transmission output switch that outputs a first transmission signal and a second transmission signal output from at least one power amplification circuit to the first filter circuit or the second filter circuit, respectively; and a first tuning circuit that adjusts impedance matching between the at least one power amplification circuit and the at least one transmission output terminal.
A power amplification module supporting multiple frequency bands according to another aspect of the present invention includes: at least one transmission input terminal to which a first transmission signal and a second transmission signal are input; at least one power amplifier circuit to which a first transmission signal and a second transmission signal are input from at least one transmission input terminal; a first filter circuit that passes a first transmission signal; a second filter circuit that passes a second transmission signal; at least one transmission output terminal that outputs the first transmission signal and the second transmission signal output from the first filter circuit and the second filter circuit; a transmission input switch that outputs a first transmission signal and a second transmission signal input from at least one transmission input terminal to one of the at least one power amplifier circuit; and a first tuning circuit that adjusts impedance matching between the at least one power amplification circuit and the at least one transmission output terminal.
Effects of the invention
According to the present invention, it is possible to provide a multiband low-noise amplifier module capable of improving the amplification efficiency of a transmission signal.
Drawings
Fig. 1 is a block diagram schematically showing a circuit configuration of a power amplification module supporting multiple bands according to a first embodiment.
Fig. 2 is a block diagram schematically showing a circuit configuration of a multiband power amplification module according to a second embodiment.
Fig. 3 is a block diagram schematically showing a circuit configuration of a multiband power amplification module according to a third embodiment.
Fig. 4 is a block diagram showing a circuit configuration for simulating the impedance of the embodiment.
Fig. 5 is a block diagram showing a circuit configuration for simulating the impedance of the comparative example.
Fig. 6 is a graph showing simulation results for the frequency band 5.
Fig. 7 is a graph showing simulation results for the frequency band 12.
Description of the reference numerals
100: power amplification module for multi-band, TXI, TX2, …, TXj: transmission signal, IN1, 1N2, …, INh: transmission input terminal, SW 1: transmit input switches, PA1, PA2, …, PAi: power amplification circuit, SW 2: transmit output switch, TNG 1: first tuning circuit, MPX1, MPX2, …, MPXj: multiplexer (filter circuit), SW 3: antenna switch, ANT1, ANT2, …, ANT j, ANT p: transmission output terminals, RX1, RX2, …, RXk: send signal, SW 4: receive input switch, TNG 2: second tuning circuit, LNA1, LNA2, …, LNAm: low noise amplifier circuits, OUT1, OUT2, …, OUTn: an output terminal is received.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the second embodiment and the subsequent embodiments, the same or similar components as those in the first embodiment are denoted by the same or similar reference numerals as those in the first embodiment, and detailed description thereof is omitted as appropriate. Note that, regarding the effects obtained in the second and subsequent embodiments, the same effects as those in the first embodiment will be appropriately omitted from the description. The drawings of the embodiments are for illustration, the sizes and shapes of the respective portions are schematic, and the technical scope of the invention of the present application should not be construed as being limited to the embodiments.
< first embodiment >
First, a configuration of a multiband power amplification module 100 according to a first embodiment of the present invention will be described with reference to fig. 1. Fig. 1 is a block diagram schematically showing a circuit configuration of a power amplification module 100 supporting multiple bands according to a first embodiment.
The power amplification module 100 for multiband is a high-frequency module that amplifies the power of a transmission signal to a level (1evel) necessary for transmission to a base station in a mobile communication terminal such as a mobile phone corresponding to a CA (Carrier Aggregation) scheme. Here, the transmission signal is, for example, an RF (Radio Frequency) signal modulated by a predetermined communication scheme, such as an RFIC (Radio Frequency Integrated Circuit).
The CA scheme is a communication scheme for simultaneously exchanging a plurality of transmission signals and a plurality of reception signals with a base station using a plurality of frequency bands (frequency bands). The CA scheme can improve communication speed and connection stability compared to a communication scheme that transmits and receives data in one frequency band. The frequency band used in the multiband power amplification module 100 is not particularly limited, and can be appropriately selected from, for example, band 1 (uplink 1920MHz-1980MHz, downlink 2100MHz-2170MHz), …, and band 255 of the E-UTRA standard.
The multiband power amplification module 100 may be a multiband power amplification module based on any one of Intra-band Contiguous CA (Intra-band Contiguous CA) using Contiguous Component Carriers (CCs) in the same frequency band as a plurality of transmission signals to be amplified, Intra-band Non-Contiguous CA (Intra-band Non-Contiguous CA) using Non-Contiguous CCs in the same frequency band, and Inter-band Non-Contiguous CA (Inter-band Non-Contiguous CA) using Non-Contiguous CCs in different frequency bands.
The multiband power amplification module 100 is not limited to the number of CCs used, and may be 2UL-CA using two uplink CCs or 3UL-CA using three uplink CCs. As the 2UL-CA, for example, a combination of a band 2 (uplink 1850MHz-1910MHz) and a band 12 (uplink 699MHz-716MHz), a combination of a band 4 (uplink 1710MHz-1755MHz) and a band 12, a combination of a band 3 (uplink 1710MHz-1785MHz) and a band 41 (uplink 2496MHz-2690MHz), a combination of a band 8 (uplink 880MHz-915MHz) and a band 41, or the like can be used. Further, as the 3UL-CA, for example, a combination of the band 2 and the band 12 and the band 30, a combination of the band 4 and the band 12 and the band 30, or the like can be used.
The multiband power amplification module 100 includes: a plurality of transmission input terminals IN1, IN2, …, INh; a transmission input switch SW 1; a plurality of power amplification circuits PA1, PA2, …, PAi; a transmission output switch SW 2; a first tuning circuit TNG 1; a plurality of multiplexers (filter circuits) MPX1, MPX2, …, MPXj; and a plurality of transmission output terminals ANT1, ANT2, …, ANT j. The power amplification block 100 that handles multiple bands amplifies a plurality of transmission signals TX1, TX2, …, TXj. The power amplification module 100 supporting multiple bands includes a configuration (not shown) for amplifying a reception signal, and can amplify a plurality of reception signals RX1, RX2, …, and RXk. The power amplification module 100 supporting the multiband operation may be configured not to amplify the received signal.
The plurality of transmission input terminals IN1, IN2, …, and INh are terminals for inputting a plurality of transmission signals TX1, TX2, …, and TXj from the outside to the power amplification module 100 corresponding to the multiband. For example, the transmission signal TX1 is input from the transmission input terminal IN1, and the transmission signal TX2 is input from the transmission input terminal IN 2. IN the configuration example shown IN fig. 1, h is an integer of 3 or more, and the power amplification module 100 compatible with multiple bands includes h transmission input terminals IN1, IN2, …, INh. In the configuration example shown in fig. 1, j is an integer of 3 or more, and the power amplification module 100 compatible with the multiband amplifies and outputs j transmission signals TX1, TX2, …, and TXj. However, the power amplification module 100 that supports multiple bands may be configured to amplify at least two transmission signals, and the number j of transmission signals may be 2 or more. When a plurality of transmission signals TX1, TX2, …, and TXj having different CCs are input from the plurality of transmission input terminals IN1, IN2, …, and INh, respectively, the number of transmission input terminals is equal to the number of transmission signals. I.e., h ═ j.
Further, a plurality of transmission signals may be input from one transmission input terminal. For example, the transmission signals TX1, TX2 may be input from one transmission input terminal IN 1. Therefore, the number of transmission input terminals of the power amplification module 100 coping with the multiband can be less than the number of transmission signals. That is, h < j can be set. The power amplification module 100 supporting multiple bands may include at least one transmission input terminal. That is, h is 1. ltoreq. h.ltoreq.j.
The transmission input switch SW1 outputs each of a plurality of transmission signals TX1, TX2, …, TXj input from a plurality of transmission input terminals IN1, IN2, …, INh to one of a plurality of power amplification circuits PA1, PA2, …, PAi. The multiband power amplification module 100 includes the transmission input switch SW1, and can selectively input each of the plurality of transmission signals TX1, TX2, …, and TXj to an appropriate power amplification circuit. Even if CC of the plurality of transmission signals TX1, TX2, …, TXj input to the power amplification module 100 supporting the multiband varies, the transmission input switch SW1 can switch the path in accordance with the variation of CC. This can suppress a decrease in amplification efficiency of the transmission signal. In addition, the transmission input switch SW1 may be omitted. That is, a specific transmission input terminal may be fixedly connected to each of the plurality of power amplifier circuits.
The transmission input switch SW1 may output a plurality of transmission signals to one power amplifier circuit, or may output a plurality of transmission signals to different power amplifier circuits. For example, when the transmission signals TX1 and TX2 are close to each other CC or when the transmission signals TX1 and TX2 are the same CC, the transmission input switch SW1 outputs the transmission signals TX1 and TX2 to the power amplification circuit PA 1. When the transmission signals TX1 and TX2 are separated from each other by CC, the transmission input switch SW1 outputs the transmission signal TX1 to the power amplifier circuit PA1 and outputs the transmission signal TX2 to the power amplifier circuit PA 2.
The plurality of power amplifier circuits PA1, PA2, …, and PAi amplify and output the powers of the plurality of transmission signals TX1, TX2, …, and TXj inputted through the transmission input switch SW 1. In the example shown in fig. 1, i is an integer of 3 or more, and the power amplification module 100 compatible with the multiband includes i power amplification circuits PA1, PA2, …, and PAi.
The number of power amplification circuits of the power amplification module 100 that supports multiple bands is not limited as long as the plurality of transmission signals TX1, TX2, …, and TXj can be amplified. For example, when the transmission signals TX1 and TX2 are close to each other CC, both of the transmission signals TX1 and TX2 can be amplified by one power amplifier circuit PA 1. Therefore, the number i of power amplifier circuits is at least 1 or more and the number h of transmission input terminals or less. That is, i is 1. ltoreq. h. As described above, if the number i of power amplifier circuits can be reduced, the power amplifier module 100 that can cope with multiple bands can be reduced in size and cost.
The transmission output switch SW2 outputs each of the plurality of transmission signals TX1, TX2, …, TXj output from the plurality of power amplification circuits PA1, PA2, …, PAi to the plurality of multiplexers MPX1, MPX2, …, MPXj. The power amplification module 100 supporting multiple bands includes the transmission output switch SW2, and thus each of the plurality of transmission signals TX1, TX2, …, and TXj can be selectively input to an appropriate multiplexer. Even if the CC of the plurality of transmission signals TX1, TX2, …, TXj output from each of the plurality of power amplification circuits PA1, PA2, …, PAi changes, the transmission output switch SW2 can switch the path in accordance with the change of the CC. This reduces the loss of the transmission signal caused by the multiplexer.
The transmission output switch SW2 may connect one power amplifier circuit to a plurality of multiplexers, or may connect a plurality of power amplifier circuits to different multiplexers, respectively. For example, when the power amplifier circuit PA1 amplifies the transmission signals TX1 and TX2, the transmission output switch SW2 simultaneously selects a first path through which the power amplifier circuit PA1 outputs the transmission signal TX1 to the multiplexer MPX1 and a second path through which the power amplifier circuit PA1 outputs the transmission signal TX2 to the multiplexer MPX 2. Further, when the transmission signal TX1 is amplified in the power amplification circuit PA1 and the transmission signal TX2 is amplified in the power amplification circuit PA2, the transmission output switch SW2 selects a first path in which the transmission signal TX1 is output from the power amplification circuit PA1 to the multiplexer MPX1 and a third path in which the transmission signal TX2 is output from the power amplification circuit PA2 to the multiplexer MPX 2. Therefore, the number i of the power amplifying circuits can be smaller than the number j of the multiplexers. As described above, if the number i of power amplifier circuits can be reduced, the power amplifier module 100 that can cope with multiple bands can be reduced in size and cost.
The first tuning circuit TNG1 adjusts the impedance matching state between the plurality of power amplification circuits PA1, PA2, …, and PAi and the plurality of transmission output terminals ANT1, ANT2, …, and ANT j. The first tuning circuit TNG1 is connected between the transmission output switch SW2 and the multiplexers MPX1, MPX2, …, and MPXj. The first tuning circuit TNGI includes, for example, a DTC (digital Tunable Capacitor). The power amplification module 100 supporting multiple bands includes the first tuning circuit TNG1, and thus can suppress a decrease in amplification efficiency of a transmission signal due to a change in the matching state between the output impedance of the power amplification circuit and the load impedance. In the case of a configuration including the transmission output switch SW2 capable of selecting a path connecting the power amplification circuit and the multiplexer, even if the matching state between the output impedance of the power amplification circuit and the load impedance changes due to the path selected by the transmission output switch SW2, the first tuning circuit TNG1 can appropriately adjust the impedance matching.
As an example, when the first path and the second path are simultaneously selected as the path connected to the power amplifier circuit PA1, the transmission output switch SW2 changes the impedance matching state as compared with the case where only the first path is selected as the path connected to the power amplifier circuit PA 1. For example, when only the first path is selected as the path connected to the power amplifier circuit PA1, the circuit is designed so that the output impedance of the power amplifier circuit PA1 matches the load impedance. In this case, by adjusting the impedance matching by the first tuning circuit TNG1 based on the change in the matching state of the impedance, it is possible to suppress a decrease in the amplification efficiency of the transmission signal TX1 when the first path and the second path are simultaneously selected by the transmission output switch SW 2. Similarly, in the second path, by adjusting the impedance matching by the first tuning circuit TNG1, it is possible to suppress a decrease in the amplification efficiency of the transmission signal TX 2.
As another example, the power amplification module 100 coping with the multiband changes the output level of the transmission signal TX1, that is, the magnification of the transmission signal TX1 in the power amplification circuit PA1, in accordance with the distance between the mobile communication terminal and the base station. For example, the circuit is designed so that the output impedance of the power amplification circuit PA1 matches the load impedance when the transmission signal TX1 output from the power amplification circuit PA1 to the multiplexer MPX1 is at a specific output level. In this case, by adjusting the impedance matching state by the first tuning circuit TNG1 in accordance with the output level of the transmission signal TX1, it is possible to suppress a decrease in the amplification efficiency of the transmission signal TX 1.
The first tuning circuit TNG1 may be configured to suppress a decrease in amplification efficiency of at least one of the at least two transmission signals amplified by the power amplification module 100 that supports multiple bands. For example, the first tuning circuit TNG1 may preferentially suppress a decrease in amplification efficiency of the transmission signal of which importance is the highest among the at least two transmission signals and allow a decrease in amplification efficiency of the other transmission signals.
The first tuning circuit TNG1 may be connected between the plurality of power amplification circuits PA1, PA2, …, and PAi and the transmission output switch SW 2. That is, the first tuning circuit TNG1 may be connected to the plurality of power amplification circuits PA1, PA2, …, and PAi, the transmission output switch SW2 may be connected to the first tuning circuit TNG1, and the plurality of multiplexers MPX1, MPX2, …, and MPXj may be connected to the transmission output switch SW 2. In this configuration, the impedance matching state can be adjusted according to the paths of the plurality of transmission signals TX1, TX2, …, and TXj selected by the transmission output switch SW 2.
The multiplexers MPX1, MPX2, …, and MPXj correspond to filter circuits through which transmission signals having different CCs pass, respectively. The multiplexer may be a diplexer. The power amplification module 100 supporting multiple bands includes at least two multiplexers for amplifying and outputting at least two transmission signals having different CCs. For example, the multiplexer MPX1 passes the transmission signal TX1 and blocks the transmission signal TX 2. The multiplexer MPX2 blocks the transmission signal TX1 and allows the transmission signal TX2 to pass through. In the example shown in fig. 1, j is an integer of 3 or more, and the power amplification module 100 compatible with the multiband includes j multiplexers MPX1, MPX2, …, and MPXj.
The plurality of transmission output terminals ANT1, ANT2, …, and ANT j are connected to the plurality of multiplexers MPX1, MPX2, …, and MPXj, respectively, and output a plurality of transmission signals TX1, TX2, …, and TXj. The plurality of transmission output terminals ANT1, ANT2, …, and ANT j are connected to an external antenna. For example, the transmission output terminal ANT1 outputs the transmission signal TX1 output from the multiplexer MPX1, and the transmission output terminal ANT2 outputs the transmission signal TX2 output from the multiplexer MPX 2. The plurality of transmission output terminals ANT1, ANT2, …, and ANT j can input the plurality of reception signals RX1, RX2, …, and RXk to the plurality of multiplexers MPX1, MPX2, …, and MPXj.
Other embodiments will be described below. In the following embodiments, description of the common matters with the first embodiment will be omitted, and only different points will be described. The components denoted by the same reference numerals as those in the first embodiment have the same structures and functions as those in the first embodiment, and detailed description thereof is omitted. The same effects based on the same structure will not be mentioned.
< second embodiment >
Next, the structure of the multiband power amplification module 200 according to the second embodiment of the present invention will be described with reference to fig. 2. Fig. 2 is a block diagram schematically showing a circuit configuration of a multiband power amplification module according to a second embodiment.
The multiband power amplification module 200 includes: a plurality of transmission input terminals IN1, IN2, …, 1 Nh; a transmission input switch SW 1; a plurality of power amplification circuits PA1, PA2, …, PAi; a transmission output switch SW 2; a first tuning circuit TNG 1; a plurality of multiplexers MPX1, MPX2, …, MPXj; and a plurality of transmission output terminals ANT1, …, ANTp.
The power amplification module 200 for multi-band is further provided with an antenna switch SW 3. The antenna switch SW3 switches paths between the multiplexers MPX1, MPX2, …, and MPXj and the transmission output terminals ANT1, …, and ANT p. In the configuration example shown in fig. 2, p is an integer of 2 or more, and the power amplification module 200 supporting multiple bands includes p transmission output terminals ANT1, …, and ANT p. However, the power amplification module 200 that supports multiple bands may have at least one transmission output terminal. That is, p is 1. ltoreq. j.
As an example, when the frequency of the transmission signal TX1 output from the multiplexer MPX1 and the frequency of the CC of the transmission signal TX2 output from the multiplexer MPX2 are close to each other, the antenna switch SW3 can output the transmission signals TX1 and TX2 to one transmission output terminal ANT1, and transmit the signals from the same external antenna. This can reduce the number p of transmission output terminals.
< third embodiment >
Next, the structure of the multiband power amplification module 300 according to the third embodiment of the present invention will be described with reference to fig. 3. Fig. 3 is a block diagram schematically showing a circuit configuration of a multiband power amplification module according to a third embodiment.
The multiband power amplification module 300 includes: a plurality of transmission input terminals IN1, IN2, …, INh; a transmission input switch SW 1; a plurality of power amplification circuits PA1, PA2, …, PAi; a transmission output switch SW 2; a first tuning circuit TNG 1; a plurality of multiplexers MPX1, MPX2, …, MPXj; an antenna switch SW 3; and a plurality of transmission output terminals ANT1, …, ANTp.
The power amplification module 300 compatible with multiple frequency bands further includes: a reception input switch SW 4; a second tuning circuit TNG 2; a plurality of low noise amplifier circuits LNA1, LNAs 2, …, LNAm; and a plurality of reception output terminals OUT1, OUT2, …, OUTn.
The reception input switch SW4 outputs each of a plurality of reception signals RX1, RX2, …, RXk input from the plurality of transmission output terminals ANT1, …, ANTp through the plurality of multiplexers MPX1, MPX2, …, MPXj to one of a plurality of low noise amplification circuits LNA1, LNA2, …, LNAm. The power amplification module 300 supporting multiple bands includes the reception input switch SW4, and thus each of the plurality of reception signals RX1, RX2, …, and RXk can be selectively input to an appropriate power amplification circuit. Even if the CC of the plurality of reception signals RX1, RX2, …, RXk input to the power amplification module 300 corresponding to the multiband varies, the reception input switch SW4 can switch the path in accordance with the variation of the CC. This can suppress a decrease in amplification efficiency of the received signal. In addition, the reception input switch SW4 may be omitted. That is, a specific multiplexer may be fixedly connected to each of the plurality of power amplifier circuits.
The reception input switch SW4 may input two or more reception signals to one low noise amplifier circuit, or may input each of two or more reception signals to different low noise amplifier circuits. For example, when the frequencies of the CCs of the reception signals RX1 and RX2 are close to each other or when the frequency bands of the CCs of the reception signals RX 3878 and RX2 are the same, the reception input switch SW4 outputs the reception signals RX1 and RX2 to the low noise amplifier circuit LNA 1. When the CC of each of the reception signals RX1 and RX2 is separated, the reception input switch SW4 inputs the reception signal RX1 to the low-noise amplifier circuit LNA1 and outputs the reception signal RX2 to the low-noise amplifier circuit LNA 2.
The second tuning circuit TNG2 adjusts impedance matching states between the multiplexers MPX1, MPX2, …, and MPXj and the low noise amplifier circuits LNA1, LNA2, …, and LNAm. The second tuning circuit TNG2 is connected between the reception input switch SW4 and the plurality of low noise amplification circuits LNA1, LNA2, …, and LNAm. The power amplification module 300 supporting multiple bands is provided with the second tuning circuit TNG2, and thus it is possible to suppress a decrease in the amplification efficiency of the received signal due to a change in the matching state between the output impedance of the low-noise amplification circuit and the load impedance. For example, in the case of a configuration including the reception input switch SW4 capable of selecting a path for connecting the multiplexer and the low-noise amplifier circuit, even if the impedance matching between the multiplexer and the low-noise amplifier circuit changes due to the path selected by the reception input switch SW4, the impedance matching can be appropriately adjusted by the second tuning circuit TNG 2.
For example, when the reception input switch SW4 connects the multiplexers MPX1 and MPX2 to the noise amplifier circuit LNA1 at the same time, the impedance matching state changes compared with the case where only the multiplexer MPX1 is connected to the low-noise amplifier circuit LNA 1. When only the multiplexer MPX1 is connected to the low noise amplifier circuit LNA1, the circuit is designed so that the output impedance of the low noise amplifier circuit LNA1 matches the load impedance. In this case, by matching the impedance based on the change in the matching state of the impedance by the second tuning circuit TNG2, it is possible to suppress a decrease in the amplification efficiency of the reception signal RX1 when both the multiplexers MPX1 and MPX2 are connected to the low-noise amplification circuit LNA 1.
The second tuning circuit TNG2 may be connected between the multiplexers MPX1, MPX2, …, and MPXj and the reception input switch SW 4. That is, the second tuning circuit TNG2 may be connected to the multiplexers MPX1, MPX2, …, and MPXj, the reception input switch SW4 may be connected to the second tuning circuit TNG2, and the low noise amplifier circuits LNA1, LNAs 2, …, and LNAm may be connected to the reception input switch SW 4. In this configuration, the impedance matching state can be adjusted according to the paths of the plurality of reception signals RX1, RX2, …, RXk selected by the reception input switch SW 4.
The plurality of low noise amplifier circuits LNA1, LNA2, …, and LNAm amplify and output each of the plurality of reception signals RX1, RX2, …, and RXk. In the example shown in fig. 3, m is an integer of 3 or more, and the power amplification module 300 compatible with the multiband includes m low noise amplification circuits LNA1, LNAs 2, …, and LNAm. In the configuration example shown in fig. 3, the number m of low-noise amplifier circuits is an integer of 3 or more and is the same as the number k of received signals. I.e., m is k. However, the power amplification module 300 for multi-band needs only to include at least one low-noise amplifier circuit, and can amplify a plurality of received signals by one low-noise amplifier circuit, and therefore, it is sufficient that m is 1 ≦ k.
The plurality of reception output terminals OUT1, OUT2, …, OUTn are terminals that output each of the plurality of reception signals RX1, RX2, …, RXk amplified by the plurality of low noise amplification circuits LNA1, LNA2, …, LNAm. The plurality of reception output terminals OUT1, OUT2, …, and OUTn are connected to the plurality of low noise amplifier circuits LNA1, LNA2, …, and LNAm. In the configuration example shown in fig. 3, the number n of reception output terminals is 3 or more and is the same as the number m of low noise amplifier circuits. I.e., n ═ m. However, the power amplification module 300 for multiband operation may have at least one reception output terminal, and may have 1. ltoreq. m.ltoreq.k.
< simulation evaluation >
Next, simulation evaluation of the effects obtained by the multiband power amplification modules 100, 200, and 300 according to the respective embodiments will be described with reference to fig. 4 to 7. Fig. 4 is a block diagram showing a circuit configuration of the embodiment. Fig. 5 is a block diagram showing a circuit configuration of a comparative example. Fig. 6 is a graph showing simulation results for the frequency band 5. Fig. 7 is a graph showing simulation results for the frequency band 12.
As shown IN fig. 4, the circuit of the embodiment includes a transmission input terminal IN, a power amplifier circuit PA, a transmission output switch SW, a tuner circuit TNG, two multiplexers MPX-B5 and MPX-B12, and two transmission output terminals ANT-B5 and ANT-B12. The transmission output switch SW connects the power amplification circuit PA and the multiplexer MPX-B5, and connects the power amplification circuit PA and the multiplexer MPX-B12. IN this circuit, a transmission signal TX-B5 of band 5 (824 MHz to 849MHz IN the upstream) and a transmission signal TX-B12 of band 12 (699 MHz to 716MHz IN the upstream) are simultaneously inputted from a transmission input terminal IN. The transmission signal TX-B5 is output from the transmission output terminal ANT-B5 via the multiplexer MPX-B5. The transmission signal TX-B12 is output from the transmission output terminal ANT-B12 via the multiplexer MPX-B12.
As shown in fig. 5, the comparative example is a configuration in which the tuning circuit TNG is omitted from the embodiment. IN the comparative example, the transmission signal TX-B5 of the frequency band 5 and the transmission signal TX-B12 of the frequency band 12 are also simultaneously input from the transmission input terminal IN. In addition, on the path between the power amplification circuit PA and the multiplexer MPX-B5, the output impedance of the power amplification circuit PA is set so as to match the load impedance when the multiplexer MPX-B5 is connected to the power amplification circuit PA alone without passing through a tuning circuit. In addition, on the path between the power amplification circuit PA and the multiplexer MPX-B12, the setting is made such that the output impedance of the power amplification circuit PA matches the load impedance when the multiplexer MPX-B12 is connected to the power amplification circuit PA alone without via a tuning circuit.
The S parameters on the transmission output terminal ANT-B5 side in each of the examples and comparative examples were simulated with reference to the S parameters in the case where the multiplexer MPX-B5 was connected to the power amplifier circuit PA alone without a tuning circuit. Similarly, the S parameters on the transmission output terminal ANT-B12 side in each of the examples and comparative examples were simulated with reference to the S parameters in the case where the multiplexer MPX-B12 was connected to the power amplifier circuit PA alone without passing through a tuning circuit.
As shown in fig. 6, the S parameter on the side of the transmission output terminal ANT-B5 in the embodiment is improved as compared with the S parameter on the side of the transmission output terminal ANT-B5 in the comparative example. As shown in fig. 7, the S parameter on the side of the transmission output terminal ANT-B12 in the embodiment is improved as compared with the S parameter on the side of the transmission output terminal ANT-B12 in the comparative example.
As described above, according to one aspect of the present invention, there is provided a multiband power amplification module including: at least one transmission input terminal; at least one power amplifier circuit to which a first transmission signal and a second transmission signal are input from at least one transmission input terminal; a first filter circuit that passes a first transmission signal; a second filter circuit that passes a second transmission signal; at least one transmission output terminal that outputs the first transmission signal and the second transmission signal output from the first filter circuit and the second filter circuit; a transmission output switch that outputs a first transmission signal and a second transmission signal output from at least one power amplification circuit to the first filter circuit or the second filter circuit, respectively; and a first tuning circuit that adjusts impedance matching between the at least one power amplification circuit and the at least one transmission output terminal.
According to the above aspect, the tuning circuit can suppress a decrease in amplification efficiency of the transmission signal due to a change in the matching state between the output impedance of the power amplifier circuit and the load impedance. Further, each of the plurality of transmission signals can be selectively input to an appropriate filter circuit by the transmission output switch. Even if the CC of the plurality of transmission signals output from each of the plurality of power amplification circuits changes, the transmission output switch can switch the path in accordance with the CC change. This makes it possible to output each transmission signal to an optimum filter circuit, and to reduce the loss of the transmission signal. Further, even if the matching state of the output impedance of the power amplification circuit and the load impedance changes due to the path selected by the transmission output switch, the tuning circuit can appropriately adjust the matching of the impedances. Since the transmission output switch can distribute the transmission signal, the number of power amplifying circuits can be made smaller than the number of filter circuits. This makes it possible to reduce the size and cost of the power amplification module that can cope with multiple frequency bands.
The power amplifier may further include a transmission input switch that outputs the first transmission signal and the second transmission signal input from the at least one transmission input terminal to one of the at least one power amplifier circuit. Thus, each of the plurality of transmission signals can be selectively input to an appropriate power amplification circuit. Even if CC of a plurality of transmission signals input to a power amplification module corresponding to a plurality of frequency bands changes, a transmission input switch can switch a path according to the change of CC. This can suppress a decrease in amplification efficiency of the transmission signal. Further, since the transmission input switch can distribute the transmission signals, the number of power amplification circuits can be made smaller than the number of transmission input terminals. This makes it possible to reduce the size and cost of the power amplification module that can cope with multiple frequency bands.
At least one of the power amplifier circuits may include a first power amplifier circuit capable of amplifying both the first transmission signal and the second transmission signal, and the transmission output switch may simultaneously select a first path for outputting the first transmission signal from the first power amplifier circuit to the first filter circuit and a second path for outputting the second transmission signal from the first power amplifier circuit to the second filter circuit. This makes it possible to reduce the number of power amplifier circuits to less than the number of filter circuits. Further, the power amplification module that can cope with multiple bands can be miniaturized and reduced in cost.
The first tuning circuit may adjust the impedance based on a change in the matching state of the impedance in each of a case where the transmission output switch selects only the first path and a case where the transmission output switch selects both the first path and the second path. Thus, even if a plurality of filter circuits are connected to one power amplifier circuit by the transmission output switch, it is possible to suppress a decrease in amplification efficiency of the transmission signal in the power amplifier circuit.
The first tuning circuit may also be connected between the transmit output switch and the first and second filter circuits.
According to another aspect of the present invention, there is provided a multiband power amplification module, including: at least one transmission input terminal to which a first transmission signal and a second transmission signal are input; at least one power amplifier circuit to which a first transmission signal and a second transmission signal are input from at least one transmission input terminal; a first filter circuit that passes a first transmission signal; a second filter circuit that passes a second transmission signal; at least one transmission output terminal that outputs the first transmission signal and the second transmission signal output from the first filter circuit and the second filter circuit; a transmission input switch for outputting a first transmission signal and a second transmission signal input from at least one transmission input terminal to one of the at least one power amplifier circuit; and a first tuning circuit that adjusts impedance matching between the at least one power amplification circuit and the at least one transmission output terminal.
According to the above aspect, the tuning circuit can suppress a decrease in amplification efficiency of the transmission signal due to a change in the matching state between the output impedance of the power amplification circuit and the load impedance. The transmit input switch is capable of selectively inputting each of the plurality of transmit signals to an appropriate power amplification circuit. Even if CC of a plurality of transmission signals input to a power amplification module corresponding to a plurality of frequency bands changes, a transmission input switch can switch a path according to the change of CC. This can suppress a decrease in amplification efficiency of the transmission signal. Further, since the transmission input switch can distribute the transmission signals, the number of power amplification circuits can be made smaller than the number of transmission input terminals. This makes it possible to reduce the size and cost of the power amplification module that can cope with multiple frequency bands.
The first tuning circuit may adjust the impedance matching state according to an output level of at least one of the first transmission signal and the second transmission signal in the at least one power amplification circuit. Even if the matching state between the output impedance of the power amplifier circuit and the load impedance changes due to a change in the output level, the matching state of the impedance can be corrected by the tuning circuit. That is, it is possible to suppress a decrease in amplification efficiency of a transmission signal due to an output level in the multiband power amplification module. For example, even when the output levels of the first transmission signal and the second transmission signal are adjusted, for example, when the distances between a device including a power amplification module supporting multiple bands and a plurality of base stations performing communication are different from each other, it is possible to suppress a decrease in amplification efficiency of at least one of the first transmission signal and the second transmission signal.
The first transmission signal and the second transmission signal may be included in the same frequency band. That is, the power amplification module corresponding to the multiple frequency bands may amplify a plurality of transmission signals corresponding to the in-band continuous CA scheme or the in-band discontinuous CA scheme.
The first transmission signal and the second transmission signal may be included in different frequency bands from each other. That is, the power amplification module for multiple bands may amplify a plurality of transmission signals corresponding to the inter-band discontinuous CA scheme.
The filter circuit may further include an antenna switch that switches paths between the first and second filter circuits and the at least one transmission output terminal. This makes it possible to output the first transmission signal and the second transmission signal to one transmission output terminal and transmit them from the same external antenna. That is, the number of transmission output terminals can be reduced.
The present invention may further include: at least one low noise amplification circuit; a reception input switch that outputs a first reception signal output from the first filter circuit and a second reception signal output from the second filter circuit to one of the at least one low-noise amplification circuit, respectively; and a second tuning circuit that adjusts impedance matching between the first filter circuit and the at least one low-noise amplifier circuit and between the second filter circuit and the at least one low-noise amplifier circuit.
Thus, each of the plurality of reception signals can be selectively input to an appropriate low-noise amplifier circuit by the reception input switch. Even if CC of a plurality of received signals input to a power amplification module corresponding to a plurality of frequency bands changes, a reception input switch can switch a low noise amplification circuit which inputs the received signals according to the change of the CC. This can suppress a decrease in amplification efficiency of the received signal. Further, by the tuning circuit, it is possible to suppress a decrease in amplification efficiency of the reception signal caused by a change in the matching state of the output impedance of the low-noise amplification circuit and the load impedance. In the case of the configuration including the reception input switch capable of selecting a path connecting the filter circuit and the low-noise amplifier circuit, the second tuning circuit adjusts the impedance matching based on a change in the matching state of the impedance, thereby suppressing a decrease in the amplification efficiency of the first reception signal when the first low-noise amplifier circuit is connected to both the first multiplexer and the second multiplexer.
The second tuning circuit may be connected between the receive input switch and the at least one low noise amplification circuit.
As described above, according to one aspect of the present invention, it is possible to provide a power amplification module for multiple bands, which can improve the amplification efficiency of a transmission signal.
The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be modified/improved without departing from the gist thereof, and the present invention also includes equivalents thereof. That is, the embodiments to which design changes are appropriately made by those skilled in the art are included in the scope of the present invention as long as the features of the present invention are provided. For example, the elements and their arrangement, materials, conditions, shapes, sizes, and the like included in the embodiments are not limited to the illustrated elements and their arrangement, materials, conditions, shapes, sizes, and the like, and can be appropriately modified. It is to be understood that the embodiments are illustrative and that partial substitutions and combinations of the structures described in the different embodiments are possible, and that these embodiments are included in the scope of the present invention as long as they include the features of the present invention.

Claims (10)

1. A low noise amplification module that supports multiple frequency bands, comprising:
a first filter circuit;
a second filter circuit;
at least one low noise amplification circuit;
a reception input switch that selectively transmits a first reception signal output from the first filter circuit and a second reception signal output from the second filter circuit to one of the at least one low noise amplification circuit, respectively; and
a second tuning circuit that adjusts impedance matching between the first filter circuit and the at least one low-noise amplification circuit based on a change in state of the impedance matching,
the second tuning circuit is connected between the receive input switch and the at least one low noise amplification circuit.
2. The multiband compatible low noise amplification module of claim 1,
the reception input switch transmits the first reception signal and the second reception signal to different low-noise amplification circuits among the at least one low-noise amplification circuit, respectively.
3. The multi-band compatible low noise amplification module of claim 1,
The reception input switch transmits the first reception signal and the second reception signal to the same low-noise amplification circuit of the at least one low-noise amplification circuit, respectively.
4. The multi-band compatible low noise amplification module of claim 1,
the reception input switch has:
a first connection state in which the first reception signal and the second reception signal are respectively transmitted to different low-noise amplification circuits among the at least one low-noise amplification circuit; and
a second connection state in which the first reception signal and the second reception signal are respectively transmitted to the same low-noise amplification circuit among the at least one low-noise amplification circuit,
the difference between the frequency of the member carrier of the first received signal and the frequency of the member carrier of the second received signal in the first connection state is greater than the difference between the frequency of the member carrier of the first received signal and the frequency of the member carrier of the second received signal in the second connection state.
5. The low noise amplification module for multi-band according to any one of claims 1 to 4,
Comprises the following steps: k filter circuits including the first filter circuit and the second filter circuit,
the at least one low noise amplification circuit has m low noise amplification circuits,
the k filter circuits respectively output k reception signals including the first reception signal and the second reception signal,
1≤m＜k。
6. the low noise amplification module for dealing with multiple frequency bands according to any one of claims 1 to 4,
the reception input switch switches paths according to a change in component carriers of the first reception signal and the second reception signal.
7. The multi-band compatible low noise amplification module according to any one of claims 1 to 4, further comprising:
at least one transmission input terminal; and
at least one power amplification circuit that inputs a first transmission signal and a second transmission signal via the at least one transmission input terminal;
the first filter circuit causes the first transmit signal to be transmitted,
the second filter circuit transmits the second transmission signal,
the low noise amplification module further includes:
at least one transmission output terminal that outputs the first transmission signal and the second transmission signal output from the first filter circuit and the second filter circuit;
A transmission output switch that selectively transmits a first transmission signal and a second transmission signal output from the at least one power amplification circuit to each of the first filter circuit and the second filter circuit, respectively; and
a first tuning circuit that adjusts impedance matching between the at least one power amplification circuit and the at least one transmission output terminal.
8. The multiband low noise amplification module of claim 7, further comprising:
and a transmission input switch configured to output the first transmission signal and the second transmission signal input from the at least one transmission input terminal to one of the at least one power amplifier circuits.
9. The multiband handling low noise amplification module of claim 7,
the at least one power amplifier circuit includes a first power amplifier circuit capable of amplifying both the first transmission signal and the second transmission signal,
the transmission output switch simultaneously selects a first path for outputting the first transmission signal from the first power amplification circuit to the first filter circuit and a second path for outputting the second transmission signal from the first power amplification circuit to the second filter circuit.
10. The multiband handling low noise amplification module of claim 9,
the first tuning circuit adjusts the impedance based on a change in a matching state of the impedance in each of a case where the transmission output switch selects only the first path and a case where the transmission output switch selects both the first path and the second path.
CN202210543543.2A 2017-05-16 2018-05-15 Low-noise amplification module for coping with multiple frequency bands Pending CN114759883A (en)

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